<!DOCTYPE html>
<html lang="en" xmlns:th="http://www.thymeleaf.org">
<head>
    <meta charset="UTF-8">
    <title>index01</title>
    <link rel="stylesheet" href="css/index.css">
</head>
<body>

<div id="root">
    <div id="wrapper">
        <div class="column">
            <!--第一行-->
            <div id="header" class="box">header</div>
            <!--第二行-->
            <div class="row">
                <div id="main1" class="main box">main</div>
                <div id="sidebar1" class="sidebar box">sidebar</div>
            </div>
            <!--第三行-->
            <div class="row">
                <div id="sidebar2" class="sidebar box">sidebar</div>
                <div id="main2" class="main box">main</div>
            </div>
            <!--第四行-->
            <div id="footer" class="box">footer</div>
        </div>
    </div>
</div>

</body>
</html>